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How many grams of dry NH4Cl need to be added to 2.40 L of a 0.400 M solution of ammonia, NH3, to prepare a buffer solution that has a pH of 8.78? Kb for ammonia is 1.8 x 10^-5.
Sketch a heating curve for a substance X whose melting point is 40oC and whose boiling point is 65oC. Describe what you will observe as a 60.0 g sample of X is warmed from 0oC to 100oC.
At the start of the experiment, both thermometers record the same temperature. Why does, after 10 min, thermometer B record a lower temperature than thermometer A?
How many grams of sodium formate, NaCHO2, would have to be dissolved in 1.3 L of 0.45 M formic acid (pKa 3.74) to make the solution a buffer for pH 3.75
If HCl concentration is reduced by 50% and the rate is reduced by 25% what is the reaction order? This is assuming the other reactant is at a constant concentration.
The freezing point of mercury is -38.8 C . What quantity of energy, in joules, is released to the surroundings if 1.00 mL of mercury is cooled from 23.0 C to -38.8 C and then frozen to a solid
What is the concentration of free [Cu2+] in an aqueous solution prepared as 0.25M in Cu2+ and 1.50M [NH3]. Cu2+(aq) + 4NH3? [Cu(NH3)4]2+ (aq) Kf = 5.0 x10^12
What is the purpose of washing your cyclohexene with saturated sodium bicarbonate. Why do you think it is more practical to wash with a solution instead of adding solid sodium bicarbonate to your cyclohexene
Outline a detailed scheme utilizing extractions that he can use to separate the mixture back into the pure components before the professor finds out.
when the following equation is balanced using the smallest possible integers what is the exponent of n2o in the
A 1.994 g sample of ethanol is combusted in a bomb calorimeter. The temperature of the calorimeter increases by 10.91 K. If the heat capacity of the bomb is 615.5 J/K and it contains 1.150 kg of water, what is the enthalpy change per mole of ethan..
a cylinder measuring 5.7 cm wide and 6.8 cm high is filled with gas. the piston is pushed down with a steady force
Asprin, whose structure can be found in the introduction, can be made from the reaction of a phenol and an anhydride. Give the phenol and anhydride that could be used to make aspirin?
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